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Related Experiment Video

Updated: Jun 22, 2026

Exploring the Role of Deontic Reasoning and World Knowledge in Wason´s Selection Task

Exploring the Role of Deontic Reasoning and World Knowledge in Wason´s Selection Task

Published on: July 22, 2025

Contradiction in universal and particular reasoning.

Maria Teresa Medaglia¹, Franca Tecchio, Stefano Seri

¹Philosophy Department, Facoltà di Lettere e Filosofia, University Roma Tre, Rome, Italy.

Human Brain Mapping

|June 26, 2009

Summary

Identifying contradictions, crucial for reasoning, involves specific brain networks. The study found that processing "Every" statements activated brain regions more intensely than "Some" statements, suggesting differing cognitive loads.

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Area of Science:

Cognitive Neuroscience
Neuroscience of Language

Background:

Contradiction identification is fundamental to human reasoning, communication, and debate.
This process relies on inverting logical operators like 'Every' and 'Some'.

Purpose of the Study:

To investigate the neural correlates and brain network dynamics underlying contradiction identification.
To explore differences in brain activation patterns when processing statements with 'Every' versus 'Some'.

Main Methods:

A high-density electroencephalographic (EEG) study was conducted on 11 healthy young adults.
Event-related brain dynamics were analyzed following sentence presentation.

Main Results:

The identification of contradiction engaged a network including orbito-frontal, anterior-cingulate, and temporo-polar cortices.
An early negative deflection (500 ms) was followed by a longer positive deflection (1.5 s) that differed based on the logical operator.
'Every' statements elicited greater network activation than 'Some' statements, indicating a more complex cognitive process.
Successful contradiction resolution activated a self-generated reward system.

Conclusions:

The brain network involved in contradiction identification shows distinct temporal dynamics for 'Every' and 'Some' logical operators.
'Every' statements require more extensive neural processing compared to 'Some' statements.
Reward circuitry may play a role in reinforcing successful contradiction identification.